On Friday, 19 July 2019 17:33:35 UTC+1, DerbyBorn wrote:
Was talking about catalytic converters the other day following another
theft and someone commented about the rotten egg smell you sometime got
from cars and someone would say - it is because the car has a catalytic
converter.

Never smell it now - what changed?

The other thing they produce is ammonia.
You certainly still smell that.

https://www.eurekalert.org/pub_relea...fo-1608100.php